Here are links to some studies I found: OREGANO -- https://www.ncbi.nlm.nih.gov/pubmed/27568869  Sensitivity of Candida albicans to essential oils: are they an alternative to antifungal agents? https://www.ncbi.nlm.nih.gov/pubmed/25952773    Composition, antimicrobial, antioxidant, and antiproliferative activity of Origanum dictamnus (dittany) essential oil. https://www.ncbi.nlm.nih.gov/pubmed/22413147   Effects of cinnamon leaf, oregano and sweet orange essential oils on fermentation and aerobic stability of barley silage. https://www.ncbi.nlm.nih.gov/pubmed/20438322    In vitro antimicrobial, antioxidant, and antispasmodic activities and the composition of the essential oil of Origanum acutidens (Hand.-Mazz.) Ietswaart. LEMONGRASS--https://www.ncbi.nlm.nih.gov/pubmed/12803563  Fungicidal and anti-aflatoxigenic effects of the essential oil of Cymbopogon citratus (DC.) Stapf. (lemongrass) against Aspergillus flavus Link. isolated from stored rice. https://www.ncbi.nlm.nih.gov/pubmed/14615795  Anti-Candida albicans activity of essential oils including Lemongrass (Cymbopogon citratus) oil and its component, citral. https://www.ncbi.nlm.nih.gov/pubmed/24888440  Essential oils: extraction, bioactivities, and their uses for food preservation.